Device suitable for dispensing liquid substances

A device suitable for dispensing a liquid substance, such as an ophthalmological substance, comprising

• a container that contains at a pressure greater than atmospheric pressure the substance to be dispensed and
• a dispenser for dispensing the substance to the outside that includes a piston element loaded by the pressure of the pressurized substance to adopt a standby position by default which prevents a preloading chamber from being flooded by a dose of the substance to be dispensed, and a valve element capable of enabling a connection between the aforementioned preloading chamber and the outside,
• the device further incorporating
• an actuation mechanism of the dispenser that sequentially first compresses a volume of air, the pressure of which is used for moving the piston element from its standby position allowing a dose of the substance to be able to flood the preloading chamber, to subsequently mechanically actuate the valve element to simultaneously enable the connection to the outside of the aforementioned preloading chamber, as well as of the volume of air previously used for moving the piston element from the standby position.